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BOULDER — Nuclear Regulatory Commission officials ordered a federal laboratory Wednesday to stop using radioactive materials until it can show its procedures are safe after a plutonium spill.
The Boulder Daily Camera reports the commission said such stop orders are rare.
An expanded team of inspectors has returned to the National Institute of Standards and Technology three weeks after the June 9 plutonium spill. About one-fourth of a gram of powder containing plutonium spilled at the lab when a vial cracked. Institute officials have said a small number of employees had internal plutonium exposure. The Associated Press
